check for lazystream update on container start (#47)

root/etc/cont-init.d/60-update-lazystream

@@ -0,0 +1,36 @@
+#!/usr/bin/with-contenv bash
+
+function prepend() {
+	while read line;
+	do echo "${1}${line}";
+	done;
+}
+
+exec 1> >(prepend "[update-lazystream] ")
+
+echo "checking for update"
+
+current_version=$(lazystream --version)
+current_version=v${current_version:11}
+
+echo "installed version: ${current_version}"
+
+latest_release=$(curl -s https://api.github.com/repos/tarkah/lazystream/releases/latest | grep 'musl.tar.gz' | grep browser_download_url | cut -d '"' -f 4)
+latest_version=$(echo $latest_release | grep -oE 'v[0-9]+\.[0-9]+\.[0-9]+' | head -n 1)
+
+echo "remote version: ${latest_version}"
+
+if [ $current_version != $latest_version ]; then
+    echo "newer version available, downloading..."
+
+    wget https://github.com/tarkah/lazystream/releases/download/$latest_version/lazystream-$latest_version-x86_64-unknown-linux-musl.tar.gz -O lazystream.tar.gz; \
+    tar xzf lazystream.tar.gz; \
+    mv ././lazystream /usr/bin/lazystream; \
+    rm lazystream.tar.gz; \
+    rm -rf lazystream/; \
+    chmod +x /usr/bin/lazystream
+
+    echo "lazystream successfully updated to ${latest_version}"
+else
+    echo "latest version already installed"
+fi